Bus flue structure of coke oven battery



July 20, 1965 F. WETHLY 3,

BUS FLUE STRUCTURE OF COKE OVEN BATTERY Filed Sept. 6, 1962 4Sheets-Sheet l FIG INVENTOR. FRAWS WE TH Y ATTORNEY July 20, 1965 F.WETHLY 3,196,086

BUS FLUE' STRUCTURE F COKE OVEN BATTERY Filed Sept. 6, 1962 4Sheets-Sheet 5 2 13 F/G.4/ f

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INVENTOR.

FRHNS WE THLY HTTOR/VEY July 20, 1965 w L BUS FLUE STRUCTURE OF COKEOVEN BATTERY Filed Sept. 6, 1962 4 Sheets-Sheet '4 INVENTOR.

' FHA/V5 WE THL Y BY 2 47' TORNE Y mm mm \m wm United States Patent3,136,686 BUS BLUE STRUQTURE GE CGKE OVEN BATTERY Frans Wethiy,Manhassct, N.Y., assignor to Allied (Ihemical Corporation, New York,N.Y., a corporation of New York Filed Sept. 6, 1962, See. N 221,849 4Claims. (Cl. 292-142) This invention relates to regenerative coke ovenbatteries and more particularly to the structure of the bus dues andports connecting the bus flues with the regenerators.

Regenerative coke oven batteries are known having crosswise extendingregenerators, i.e., regenerators extending across the width of thebattery, with built-in ports connecting the bus flues at the base of theregenerators with the regenerators to regulate the flow of air preheatedin the air-inflow regenerators thereinto and the outflow of products ofcombustion into the bus flues which communicate with the chimney flue orlines.

Heretofore known constructions of such bus fl e ports are ineffective tocontrol oven heatiru under conditions of slowdown or standby conditions,which arise from time to time for economic reasons or because of strikesor for other reasons. When it becomes necessary to operate a coke ovenbattery under slowdown conditions, with consequent longer coking times,the flow of air, particularly to the interior zones of the inflowregenerators, and the outflow of combustion products from the interiorzones of the regenerators, must be restricted. This cannot be donereadily or conveniently, as a practical matter, with heretofore knownconstructions of bus flue ports.

The problem of controlling flow into and from the interior zones of theregenerators, bearing in mind that a battery may be 30 to 40 feet wideor wider, also arises when a battery is operated under standbyconditions, burning a controlled limited amount of gas in the dues tokeep the battery hot and at such temperature that the refractorybrickwork will not develop cracks. Gas may be burned only in the heatingflues at the coke and pusher sides or" the battery to take into accountheat losses at the sides because of exposure to the atmosphere, andmaintain the battery at or above the critical temperature of therefractory brickwork, below which marked contraction of the refractorybrickwork takes place that, if permitted to occur, could cause excessivecrack formation. This requires the substantially complete interruptionof the supply of air to interior zones of the inflow regenerators whilesupplying air to the zones of the air-inflow regenerators adjacent tothe sides of the battery and the control of the flow of products ofcombustion so that most of the combustion products pass through theaforesaid zones of the outflow regenerators adjacent to the sides of thebattery. Heretofore known constructions of bus flue ports do not readilyor conveniently admit of the necessary adjustment of the interior busflue ports to obtain such flow into and from the regenerators.

It is a principal object of the present invention to provide aregenerative coke oven battery having crosswise extending regeneratorsprovided with bus flues in the base thereof through which air issupplied to the air-inflow regenerators and products of combustiondischarged from the outflow regenerators, which bus flues communicatewith the regenerators through orifices, the size of which can readily becontrolled from the sides of the battery to give desired rates of flowthroughout the width of the battery at all times during operationthereof, including operation during slowdown or standby conditions,should this become necessary.

Other objects and advantages of this invention will be 'ice apparentfrom the following detailed description of the invention in connectionwith the illustrated embodiments thereof. The invention, however, is notlimited to these illustrated embodiments, but is applicable to all cokeoven batteries having crosswise extending regenerators, including suchrcgenerators having partitions or division walls separating them intocompartments or sections, one in back of the next in alignment in adirection across the width of the battery, and the regeneratorarrangement in so called two-divided ovens in which all of the cross wie extending regenerators on one side of the battery operate for inflowwhile those on the opposite side operate for outflow, and vice versa.

In the attached drawings forming a part of this specification andshowing for purposes of exemplification of preferred embodiments of theinvention, but without limiting the invention to these embodiments:

FIGURE 1 is a composite vertical section taken crosswise to the battery,the left hand portion being taken through a heating wall, and the righthand portion being taken through a coking chamber and regenerator chamber of an under jet coke oven battery embodying the present invention;

FIGURE 2 is a vertical section through a gas gun twin flue regenerativecoke oven battery taken lengthwise of the battery;

FIGURE 3 is a fragmentary vertical section through an end of aregenerator and the communicating bus flue;

FIGURE 4 is a fragmentary plan view of a regulating structure forcontrolling the size of the orifice openings providing communicationbetween the bus flue and the regenerator thereabove;

FZGURE 5 is a fragmentary vertical selection through a regenerat-or andbus flue therebeneath showing the location of the regulating structure;

FIGURE 6 is a fragmentary vertical section through the regulatingstructure taken in a plane passing through line 6-6 on FIGURE 4;

FIGURE 7 is a fragmentary section taken in a plane passing through line77 on FIGURE 4;

FIGURE 8 is a fragmentary horizontal section and plan view showing thestructure at the longitudinal median of the battery, i.e., half wayacross the width of the battery where the regulating structures for eachrow of crosswise extending regenerators abut; these structures extendinwardly from the opposite sides of the battery toward each other, withtheir longitudinal axes aligned;

FIGURE 9 is a fragmentary plan view of the preferred form of moveableorifice plate;

FIGURE 10 is a vertical section through the center line of the plate ofFIGURE 9;

FIGURE 11 is a vertical section through an assembly of stationary andmovea-ble orifice plates employing the modification of FIGURE 9; and

FIGURE 12 is a plan view of the regulating structure of FIGURE 11.

Referring to FIGURE 1 of the drawings, the coke oven battery structureillustrated is of the underjet hairpin flue type and comprises afoundation'll) which extends the fuil length and width of the battery.Resting on this foundation are the pillars 11 which support the mat 12defining the upper surface of the basement space 13. The battery properrests on mat 12 and is built from refractory brickwork to contain aseries of crosswise or transversely extending high coking chambers 14,say from 14 to 20 feet high, with heating walls alternating with thecoking chambers. The heating walls each contain a plurality of hairpinflues each constituted of two branches 16 and 17 interconnected at theirtops as at 18.

In the lower portion of this oven battery structure, as best shown inFIGURES 1, 2 and 5, are transversely or a crosswise extendingregenerators 21 beneath the coking chambers 14 thereabove.

The crosswise extending regenerators 21 are connected to the heatingflues by ducts 22. They can be of any known type of crosswise extendingregenerators employed in coke oven batteries. In the case of twin flueovens, they can be arranged in pairs along the length of the batterywith each pair serving the inflow heating lines on the opposite sides ofa coking chamber therea-bove and the next pair the outflow lines, and soon for the length of the battery, as shown in FIGURE 2 and disclosed,for example, in my co-pending patent application Serial No. 141,197,filed September 27, 1961. In the case of other types of coke ovenbatteries, such as the well known Wilputte two-divided oven orfour-divided coke oven battery, the regenerators are arranged so thatlongitudinally of the battery all the regenerators in a row are in thesame phase and crosswise of the battery an air-inflow regenerator ispositioned adjacent to an outflow regenerator. Since such regeneratorconstructions are well known, further description thereof is believedunnecessary.

In the battery shown in FEGURE 1, each crosswise extending regenerator21 is divided into a plurality of side by side compartments 23, with onesuch compartment for each inflow flue of a heating wall above. Asindicated, this invention is not limited to such compartmentation of theregenerators; compartment-s dimensioned to communicate with more thanone flue can be used, it

desired. Each compartment supplies-preheated air to support combustionor receives products of combustion from a flue or flues of a heatingwall above, in the case of an oven battery, in which rich gas notrequiring preheating, is burned to heat the battery. For the well knowncombination ovens employing lean gas, such as blast furnace gas, whichrequires preheating, as conventional, crosswise extending regeneratorsmay be arranged along the length of the battery for preheating both theair and lean gas fed to the inflow heating fines and for outflow ofproducts of combustion from the outflow heating flues, with periodicreversal of flow of the respective media through the inflow and outflowregenerators.

Each regenerator 21 has at its base a bus flue 24 which communicateswith an air inlet port 25 at one side of the battery, flow through whichis controlled by a valve 26 actuated by conventional reversing mechanismso that alternate valves 26 along the length of the battery controllingflow to the air inflow regenerators are all open while the valvescontrolling air flow to the products of combustion outflow regeneratorsare closed. Upon reversal, which may take place as often as everyminutes to speed up the coking cycle, the air ports which werepreviously open are closed and those which had been closed are opened.

Each bus flue 24, at the opposite side of the battery communicates witha chimney flue 27 through a connecting duct 28, flow through which iscontrolled by a valve 29 actuated by conventional reversing mechanism sothat these valves 29 controlling flow from the outflow regenerators areopen while the valves 29 controlling flow 'to the air inflowregenerators are closed, interrupting communication between theremaining regenerators and the chimney flue 27. Upon reversal, valves 29which had previously been open are closed and those which had previouslybeen closed are opened.

Each coking chamber of the oven battery, as conventional, ispro-videdwith charging holes 31 in its top and a gas otftake 32 communicatingwith a collector main 33 through the uptake 34, flow through which iscontrolled by valve 35. A gas main 37 supplies heating gas to theheaders 33 communicating with the valve controlled lines 39 supplyingthe heating gas tothe burners 41 in theheating flues. The valvescontrolling fl w of the heating gas are located in the basement space 13Where they can readily be adjusted. 42 is a decarbonizing air main tosupply decarbonizing air to burn out carbon deposits in the burnersduring the operating periods when fuel gas is not supplied to theburners, in accordance with conventional operating techniques. While theabove description refers particularly to an underiet oven having asingle chimney flue 27, it will be understood the present invention isnot limited thereto, but is applicable to gas gun ovens such as shown inFEGURE 2 in which the gas conduits 39' are built into the battery, asconventional, and communicate with the burners 41, to such ovens havingchimney flues at both sides of the battery, and to all coke ovenbatteries having crosswise extending regenerators to regulate flowbetween the bus flue and the regenerato-rs in both directions from thebus flue through the ports into the regenerators and products ofcombustion outflow from the regenerators through the ports into the busflue to give optimum rates of flow under widely varying conditions ofoperation of the battery as may be required when it is necessary tochange the operation of the battery from standard conditions to standbyconditions or under slowdown condiions involving a substantial decreasein the coking time, say from about 16 hours to a week.

Operating under standby conditions, general practice is to burn gas inth heating flues at the coke and pusher sides of each heating wall only.This requires that the ports or orifices connecting the bus flue withthe regenerator compartments or portions of an on-compartmentedregenerator communicating with the interior heating flues be closed ornearly closed so that little or no air is admitted to these interiorheating flues. When operating under slowdown conditions with greatlyreduced volume of heating gas fed to the interior heating flues, acorresponding smaller volume of lair'must be admitted to these interlorheating flues. The outflow of products of combustion should also becontrolled to effect distribution of heating of the regenerator portionsto effect maximum heating of those portions or compartments whichcomunicate with the coke and pusher side heating flues of each heatingwall. The present invention provides an efficient, simple constructionwhich permits ready adjustment of the size of the orifice openingsconnecting the bus flues with their regenerators to eifect the desiredcontrol of flow into and out of each regenerator.

Referring to FIGURES 3 to 8 of the drawings and particularly to FIGURE5, each bus flue 24 has the brickwork defining the upper portion thereofarranged to provide a supporting ledge 51 extending on opposite sides ofthe top of the bus flues for the full length thereof. The ledges 51define sides of opening 52 running the length of the bus flue. As shownin FIGURE 8, the battery has brickwork obstructions or stops 53 alongits longitudinal median in the area of bus flues 24, that extend fromopposite sides of the battery toward its median. These stops 53 extendtoward each other along the longitudinal median of the battery acrossthe top of each bus flue 24. Stops or Walls 53 can extend the fullheight of the bus flues and project thcreabove in the plane ofstationary or fixed orifice plates 54, 54 resting on ledges 51. Thesestationary plates are fixed to ledges 51 in any suitable manner, as forexample by being dimensioned so that, once positioned, they areincapable of appreciable movement.

In the embodiment shown in the drawings, orifice plate 54 extends fromthe right hand side of the battery toward the longitudinal median of thebattery where is terminates in a reduced end portion 55 providingshoulders 56 posiwould otherwise be required. A single long plate,however, can be used if desired.

Each stationary plate 54 and 54, desirably, is composed of a pluralityof sections S joined end to end. Each section has a row of closelyspaced openings 57, each of a cross-sectional extent designed to giveoptimum flow characteristics where located when fully open. Circularopenings are preferred but the invention is not limited to anyparticular shape of openings. These openings are arranged in a row withtheir centers on the longitudinal median line of the orifice plate.While the'number of such orifice openings and their spacing can bevaried as desired for optimum results, in general, openings having adiameter of about Vs to 1 inch spaced from the center of one to thecenter of the next approximately 2% inches gives good results.

Cooperating with each orifice plate 54 and 54' is a sllding orificeplate 58 and 53', respectively. Each sliding plate is narrower than thefixed plate on which it rests and is composed of sections 61 joined endto end. Each of the sections has along its longitudinal median aplurality of closly spaced openings 59 which, in the case of theinterior sections, are equal in number to the number of openings 57 inthe fixed plate therebelow. Desirably, and as shown in FIGURE 12 anddescribed more fully hereinafter, the end sections of the orifice platesat the coke and pusher side of the battery have an elongated opening inthe area overlying the end orifice openings in the stationary platelarge enough to leave unchanged the end orifice openings when theposition of the moveable orifice plate is adjusted. These end orificeopenings control fiow through the portions or" the regeneratorscommunicating with the heating fines on the coke and pusher sides of thebattery which do not require adjustment when changing from normaloperation to operations under standby or slowdown conditions.

The cross-sectional area of an opening 59 is larger than thecross-sectional area of the cooperating opening 57 in the fixed orificeplate, i.e., in the case of circular openings the diameter of 59 islarger than that or 57. Openings 59 have a diameter of about 1% inches,and are spaced from center to center a distance of 2% inches. Thespacing between the openings 59 is such as to provide a solid wall 6 8on the opposite sides of each opening 59; depending on the extent oflimited movement of upper slidable plate 53 or 58', the size of eachopening 57 can be controlled from fully open to partially or fullyclosed, as desired to obtain optimum flow characteristics. Furthermore,such control can be efiected with only small or limited movement of asliding plate. The sliding plate need be moved from the position shovmin FIGURE 6, the fully open position of the orifices, a distance lessthan the diameter of an opening 59 to eiiect the desired maximumreduction in flow to the interior portions of the regenerators. Thus,maximum movement, in the embodiment hereinabove described, is only about1 inch.

Desirably, each section 61 and each section S of the stationary orificeplates 5 is coextensive in length with the distance a compartment 23 ofa :regenerator occupies along the length of a crosswise extendingregenerator. Each section 61 desirably is provided with about 12openings 59 of appropriate size as disclosed above.

Contiguous sections 61 are joined as shown in FIG- URES 4 and 6. Aright-hand section 61 viewing FIG- URE 4 has secured thereto, as by spotwelding, the end 62 of a T member 63. The leg of this T member passesbetween the upstanding guide members 64;, secured, as by spot welding,to the left-hand section 61 viewing FIG- URE 4. The head d5 of the Tmember is arranged to engage these upstanding members 64 when theright-hand section 61 shown in FIGURE 4 is moved in a. righthanddirection. Such movement effects movement of the left-hand adjoiningsection due to engagement between the head 65 of the T member 63 withthe upstanding members 64. Sliding movement in the opposite directioneffects corresponding movement of an adjoining lefthand section 61 dueto the leading edge of the righthand section engaging the adjoining edgeof the left-hand section 61.

To enable movement of the sliding orifice plate 58 and 53' to beeffected readily, the end section adjacent to the side of the battery ofplate 58 at the pusher side is disposed in a chamber 66 positioned justabove the upper end of the bus flue and extending to the pusher side ofthe battery. The end section of plate 58' at the coke side of thebattery is positioned in a similar chamher on the coke side. There isone such chamber for each plate 58 and 53 respectively. Each of thesecham bers at the side of the battery is closed by a door or otherclosure 67 which can be removed to give access to the upstanding lip orhandle 68 on the end section 61. A suitable tool can be inserted inchamber 66 to engage lip or handle 68 to effect the desired adjustment.

Each sliding orifice plate 58 and 58' i maintained centered relative tothe stationary orifice plate 54 and 54', respectively, with theirlongitudinal axis coincident during relative movement by guides 70secured to each fixed plate 54, S4 at opposite sides of the narrowercooperating slidable plate 58, 53. Thus, as shown in FIGURES 4, 6 and 7,each guide 70, positioned at the joint between contiguous sections 61,comprises an overhanging guide plate 69 spaced from the stationary plate54, 54' by an intervening plate 71, the side edge of which abut the sideedges of the slidable plates and thus maintain the latter centeredrelative to the stationary plate. The assembly of guide plate 69 andintervening plate 71 for each pair of contiguous sections 61, is securedas by spot welding to the left-hand section S, viewing FIGURE 4, andpinned to the right-hand section S by a rivet or pin 72. One suchassembly is positioned at the opposite sides of each pair of adjoiningsections 61 of the slidable plate.

Movement of the ends of each of the innermost sections 61 of the slidingorifice plates 58 and 58' at the longitudinal median of the battery isguided by the guides 82 comprising an overhanging guide plate 83 spacedfrom the stationary plate 54, 54' by an intervening plate 84. The plates83 and 84 are secured as by spot welding to the ends of sections 54,54'. The inner ends of these guides 82 and the inner ends of thestationary plates 54- and 54- abut along the line 85 which issubstantially coincident with the longitudinal median of the battery.The sliding plates 58 and 58' terminate respectively in end edges 86 and87 which, as shown in FIGURE 8, are separated by the space 88. Thisspace is sufiicient to permit the necessary limited sliding movement ofslid able plates 58 or 58 or both, to effect the desired adjustment oforifice openings 5'1.

In the preferred embodiment of FIGURES 9 to 12, the moveable orificeplates are composed of sections constituted of an end section 9% havinga lip or handle 68' joined to a section 91 which in turn is joined to anadjacent section 91. The joint between adjacent sections is affected byspot welding or otherwise suitably securing a plate or joining member92, so that the underside of the marginal ends of plate 92 are securedto the adjacent spaced ends 93 and 94 of adjoining sections, as shown inFIGURE 10.

Section 99 has .an elongated opening Q5 which in the embodiment shown inthe drawings has a length of about 30 inches so that in all positions ofadjustment of the slidable orifice plate-s, opening $5 does not restrictflow through the two orifice openings at each of the ends of thestationary orifice plate adjacent the coke side and pusher side of thebattery. It also has a flow control opening 95' at the right-hand endviewing FIGURES 9 and 10. Plate 92 ha a hole or slot 96 which iselongated in the direction of the length of the moveable orifice plate.Plate 92 has adjacent to slot 96 a flow control opening 97. Each of thesections 91 has a plurality of spaced flow control or orifice regulatingopenings 93, desirably of a diameter of about l /s inches and spaced asshown in FIGURES 9iand 10.

The stationary or fixed orifice plate, shown in FIG- URE 11, is made byjoining sections 101 by top and bottom securing plates 1132 and 193which are spot welded at 1%- to the right-hand section 101, viewingFIGURE The plates 1132 and 1413 have openings 1% aligned with an opening165 in the end of left-hand section 11 11, viewing FIGURE 11. A rivet 1%having a head 107 dimensioned so that it cannot pass through theelongated opening 96 passes through opening 96 and aligned openings 104'and 195. The shank of rivet 166 is dimensioned to pass through opening96 with small clearance at the sides of elongated slot 96 in thedirection of its length, thus maintaining the moveable orifice platescentered relative to the stationary orifice plate du'ing movementthereof in a direction crosswise of the battery, The fixed orifice platethus produced from a plurality of sections 191, has a plurality ofopenings 11% desirably of a diameter of about 1 inch and spaced apartfrom center to center the same distance as between the correspondingregulating openings in the moveable orifice plate, except for theopenings in each end section, underlying end section 90. The endsections of the fixed orifice plate at the opposite sides of the batteryhave the openings therein dimensioned and spaced to give the desiredfiow characteristicthrough the portions of regenerators at the coke andpusher side of the battery.

As' shown in FIGURE 11, the joining plates 192 of each pair ofstationary sections are positioned in the space between correspondingadjacent sections of the moveable orifice plate, which adjacent sectionsare bridged by joining member 92.

With the parts positioned as shown in FIGURE 11 so that the openings 110in the stationary plate are fully open, i.e., with the centers ofopenings 11% and 98 aligned, rivet 111 5 is positioned at the extremeleft-hand end of elongated slot 96 and a clearance space 111 is formedbetween the right-hand end of joining plate 1% and the left-hand end 112of section $1 shown in FIGURE 11. This space 111 and the elongated slotas are dimensioned to permit the necessary movement of the moveableorifice plate to effect the desired regulation of the interior orificeopenings. The walls defining the ends of slot 95 and the end wallsdefining space 111 thus limit the extent of sliding movement of themoveable orifice plate. With the construction shown in FIGURES 9 to 11,involving orifice openings in the stationary plate having a diameter ofabout 1 inch and openings in the moveable plate having a diameter ofabout 1 /8 inch, arranged as shown in the drawings, a maximum movementof 4 inch is adequate to give the desired regulation for standby serviceand even less movement is necessary to obtain the desired regulation forslowdown conditions of operation.

While a preferred embodiment of this invention has been shown anddescribed, it will be apparent to those skilled in the art that changesmay be made therein without departing from the scope of the invention.Accordingly, all matter contained in the above description or shown inthe accompanying drawings shall be interpreted as illustrated and not ina limiting sense.

What is claimed is: t

1. In a regenerative coke oven battery having alternate heating wallshaving heating flues therein and coking chambers with crosswiseextending regenerators be: neath the coking chambers and communicatingwith the heating flues, at least one chimney flue, a bus flue in thebase portionof each crosswise extending regenerator communicablyconnecting said regenerator with the chimney flue for outflow ofproducts ofcombustion from said regen'erator to the chimney fiue, andmeans for supplying air to the bus flu es in the crosswise extendingregen erators serving for inflow of air, each of said bus finesextending along substantially the full length'of its regenerator to oneside of the battery, the improvement com prising stationary orificeplate means located at the top of each bus flue extending substantiallythe full length thereof and having a row of closely spaced orificeopenings extending in substantially longitudinal alignment along thelength of said stationary orifice plate means, slidable orifice platemeans in superimposed relation with said stationary orifice plate meansin each bus fine, said slidable orifice plate means having an elongatedorifice opening at each of the end portions thereof positioned in thportions of the regenerators located adjacent the sides of the battery,which elongated openings in all positions of adjustment of the slidableorifice plate means relative to the stationary orifice plate means ispositioned in superimposed relation with respect to a plurality oforifice plate openings at each of the end portions of said stationaryorifice plate means so as not to restrict flow through the said orificeopenings at the said end portions of said stationary orifice platemeans, the said slidable orifice plate-means having intermediate portionthereof between said end portions provided with a row of closely spacedorifice openings extending in substantially longitudinal alignment alongthe length of said intermediate portion, with the respective orificeopenings in the said intermediate portion of the slidable orifice platemeans positioned relative to the orifice openings in the intermediateportion of the stationary orifice plate means to form aligned pairs ofopenings in the intermediate portions of both the stationary andslidable orifice plate means through which flow takes place, the orificeopenings in the intermediate portion of said slidable orifice platemeans having a cross-sectional area larger than the paired orificeopenings in the intermediate portion of the stationary orifice platemeans, and slidable orifice plate means having one end thereofpositioned adjacent to one side of the battery so that it is accessiblefrom that side of the battery for effecting sliding movement of theslidable orifice plate means relative to the stationary orifice platemeans to adjust the size of the interior pairs of aligned openings insaid intermediate portions of both of said orifice plate means from thefull size of the orifice openings in the intermediate portion of thestationary orifice plate means to any desired reduction in size fromsaid full size.

2. In a regenerative coke oven battery as defined in claim 1 in whichthe said stationary orifice plate means is constituted of sectionsjoined together in end to end relation and the said slidable orificeplate means is constituted of sections joined together in end to endrelation, with the end sections adjacent the sides of the battery havingside elongated orifice openings therein.

3. In a regenerative coke oven battery as defined in claim 1, and inwhich each crosswise extending regenerator is divided into compartments,one in back of another, the improvement which comprises having eachslidable orifice plate composed of sections in end to end relation, eachsection being of substantially the same length as the crosswise distanceof the battery occupied by the compartment of the regenerator in whichthe section is disposed, the end sections each having therein the saidelongated orifice opening.

4. In a regenerative coke oven battery having alternate heating wallshaving heating fines therein and coking chambers with crosswiseextending regenerators bee neath the coking chambers and communicatingwith the heating fines, the said crosswise extending regeneratorscomprising regenerators extending from one side of the battery towardthe longitudinal median of the battery and other regenerators extendingfrom the opposite side of the battery toward the longitudinal median ofthe battery, each of said regenerators having a bus flue thereinextending substantially the full length of the regenerator to one sideof the battery, means for supplying air to the bus lines in thecrosswise extending regenerators serving for the inflow of air, theimprovement which comprises,

arse-,ose

a stationary orifice plate for each bus flue located at the top thereofextending substantially the full length thereof, said stationary orificeplate having a row of closely spaced orifice openings extending insubstantially longitudinal alignment along the length of said orificeplate, a slidable orifice plate for each stationary orifice plate, saidslidable orifice plate having an elongated orifice open ing at the endportion thereof positioned in the portion of the regenerator locatedadjacent the side of the battery, which elongated opening in allpositions of adjustment or" the slidable orifice plate relative to thestationary orifice plate is positioned in superimposed relation withrespect to a plurality of orifice plate openings at the end portion ofsaid stationary orifice plate so as not to restrict flow through thesaid orifice openings at the said end portion of said stationary orificeplate, the said slidable orifice plate also having a row of closelyspaced orifice openings extending in substantially longi tndinalalignment, with the respective orifice openings in the said row in theslidable orifice piate positioned relative to the orifice openings inthe stationary orifice plate to form aligned pairs of openings throughwhich flow takes place between the bus fine and the regeneratorthereabove, the said aligned pairs of openings having the orificeopenings in the slidable orifice plate of a crosssectional area largerthan the paired orifice openings in the stationary orifice plate, saidslidable orifice plate havi0 ing one end thereof positioned adjacent tothe side of the battery so that it is accessible from that side of thebattery for effecting sliding movement of the slidabie orifice platerelative to the stationary orifice plate to adjust the size of the saidaligned pairs of openings from the full size of the orifice openings ofsaid aligned pairs in the stationary orifice plate to any desiredreduction in size from said full size and thus control the flow of airfrom said hue flue into the regenerator thereabove while saidregenerator operates for inflow, and the outflow of products ofcombustion from said regenerator to the bus flue While said regeneratoroperates for outfiow.

MORRIS O. WOLK, Primary Examiner. DGNALL H. SYLVESTER, Examiner.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent NO.3,196,086 July 20, 1965 Frans Wethly It is hereby certified that errorappears in the above numbered patent requiring correction and that thesaid Letters Patent should read as corrected below.

Column 2, line 33, for "selection" read section column 4, lines 21 and22, for "condiions" read conditions line 25, for "th" read the samecolumn 4, line 28, for "an on-compartmented" read a non-compartmentedcolumn 8, line 34, for "and" read said line 51, for "side" read saidsame column 8, line 75, strike out "the", first occurrence; column 10,line 9, for "bue" read bus Signed and sealed this 15th day of February1966.

( L) Attest:

ERNEST w. SWIDER EDWARD J. BRENNER Attesting Offioer Commissioner ofPatents

1. IN A REGENERATIVE COKE OVEN BATTERY HAVING ALTERNATE HEATING WALLSHAVING HEATING FLUES THEREIN ND COKING CHAMBERS WITH CROSSWISE EXTENDINGREGENERATORS BENEATH THE COKING CHAMBERS AND COMMUNICATING WITH THEHEATING FLUES, AT LEAST ONE CHIMNEY FLUE, A BUS FLUE IN THE BASE PORTIONOF EACH CROSSWISE EXTENDING REGENERATOR COMMUNICABLY CONNECTING SAIDREGENERATOR WITH THE CHIMNEY FLUE FOR OUTFLOW OF PRODUCTS OF COMUBSTIONFROM SAID REGENERATOR TO THE CHIMNEY FLUE, AND MEANS FOR SUPPLYING AIRTO THE BUS FLUES IN THE CROSSWISE EXTENDING REGENERATORS SERVING FORINFLOW OF AIR, EACH OF SAID BUS FLUES EXTENDING ALONG SUBSTANTIALLY THEFULL LENGTH OF ITS REGENERATOR TO ONE SIDE OF THE BATTERY, THEIMPROVEMENT COMPRISING STATIONARY ORIFICE PLATE MEANS LOCATED AT THE TOPOF EACH BUS FLUE EXTENDING SUBSTANTIALLY THE FULL LENGTH THEREOF ANDHAVING A ROW OF CLOSELY SPACED ORIFICE OPENINGS EXTENDING INSUBSTANTIALLY LONGITUDINAL ALIGNMENT ALONG THE LENGTH OF SAID STATIONARYORIFICE PLATE MEANS, SLIDABLE ORIFICE PLATE MEANS IN SUPERIMPOSEDRELATION WITH SAID STATIONARY ORIFICE PLATE MEANS IN EACH BUS FLUE, SAIDSLIDABLE ORIFICE PLATE MEANS HAVING AN ELONGATED ORIFICE OPENING AT EACHOF THE END PORTIONS THEREOF POSITIONED IN THE PORTIONS OF THEREGENERATORS LOCATED ADJACENT THE SIDES OF THE BATTERY, WHICH ELONGATEDOPENINGS IN ALL POSITIONS OF ADJUSTMENT OF THE SLIDABLE ORIFICE PLATEMEANS RELATIVE TO THE STATIONARY ORIFICE PLATE MEANS IS POSITIONED INSUPERIMPOSED RELATION WITH RESPECT TO A PLURALITY OF ORIFICE PLATEOPENINGS AT EACH OF THE END POSITIONS OF SAID STATIONARY ORIFICE PLATEMEANS SO AS NOT TO RESTRICT FLOW THROUGH THE SAID ORIFICE OPENINGS ATTHE SAID END PORTIONS OF SAID STATIONARY ORIFICE PLATE MEANS, THE SAIDSLIDABLE ORIFICE PLATE MEANS HAVING INTERMEDIATE PORTION THEREOF BETWEENSAID END PORTIONS PROVIDED WITH A ROW OF CLOSELY SPACED ORIFICE OPENINGSEXTENDING IN SUBSTANTIALLY LONGITUDINAL ALIGNMENT ALONG THE LENGTH OFSAID INTERMEDIATE PORTION, WITH THE RESPECTIVE ORIFICE OPENINGS IN THESAID INTERMEDIATE PORTION OF THE SLIDABLE ORIFICE PLATE MEANS POSITIONEDRELATIVE TO THE ORIFICE OPENINGS IN THE INTERMEDIATE PORTION OF THESTATIONARY ORIFICE PLATE MEANS TO FORM ALIGNED PAIRS OF OPENINGS IN THEINTERMEDIATE PORTIONS OF BOTH THE STATIONARY AND SLIDABLE ORIFICE PLATEMEANS THROUGH WHICH FLOW TAKES PLACE, THE ORIFICE OPENINGS IN THEINTERMEDIATE PORTION OF SAID SLIDABLE ORIFICE PLATE MEANS HAVING ACROSS-SECTIONAL AREA LARGER THAN THE PAIRED ORIFICE OPENINGS IN THEINTERMEDIATE PORTION OF THE STATIONARY ORIFICE PLATE MEANS, AND SLIDABLEORIFICE PLATE MEANS HAVING ONE END THEREOF POSITIONED ADJACENT TO ONESIDE OF THE BATTERY SO THAT IT IS ACCESSIBLE FROM THAT SIDE OF THEBATTERY FOR EFFECTING SLIDING MOVEMENT OF THE SLIDABLE ORIFICE PLATEMEANS RELATIVE TO THE STATIONARY ORIFICE PLATE MEANS TO ADJUST THE SIZEOF THE INTERIOR PAIRS OF ALIGNED OPENINGS IN SAID INTERMEDIATE PORTIONSOF BOTH OF SAID ORIFICE PLATE MEANS FROM THE FULL SIZE OF THE ORIFICEOPENINGS IN THE INTERMEDIATE PORTION OF THE STATIONARY ORIFICE PLATEMEANS TO ANY DESIRED REDUCTION IN SIZE FROM SAID FULL SIZE.